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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.io;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.annotations.Beta;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import com.google.common.base.Charsets;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import com.google.common.base.Joiner;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import com.google.common.base.Splitter;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import com.google.common.hash.HashCode;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import com.google.common.hash.HashFunction;<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.io.BufferedReader;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.io.BufferedWriter;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.io.Closeable;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.io.File;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.io.FileInputStream;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.io.FileNotFoundException;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.io.FileOutputStream;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import java.io.IOException;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import java.io.InputStream;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import java.io.InputStreamReader;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import java.io.OutputStream;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import java.io.OutputStreamWriter;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import java.io.RandomAccessFile;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import java.nio.MappedByteBuffer;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import java.nio.channels.FileChannel;<a name="line.43"></a>
<span class="sourceLineNo">044</span>import java.nio.channels.FileChannel.MapMode;<a name="line.44"></a>
<span class="sourceLineNo">045</span>import java.nio.charset.Charset;<a name="line.45"></a>
<span class="sourceLineNo">046</span>import java.util.ArrayList;<a name="line.46"></a>
<span class="sourceLineNo">047</span>import java.util.List;<a name="line.47"></a>
<span class="sourceLineNo">048</span>import java.util.zip.Checksum;<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>/**<a name="line.50"></a>
<span class="sourceLineNo">051</span> * Provides utility methods for working with files.<a name="line.51"></a>
<span class="sourceLineNo">052</span> *<a name="line.52"></a>
<span class="sourceLineNo">053</span> * &lt;p&gt;All method parameters must be non-null unless documented otherwise.<a name="line.53"></a>
<span class="sourceLineNo">054</span> *<a name="line.54"></a>
<span class="sourceLineNo">055</span> * @author Chris Nokleberg<a name="line.55"></a>
<span class="sourceLineNo">056</span> * @since 1.0<a name="line.56"></a>
<span class="sourceLineNo">057</span> */<a name="line.57"></a>
<span class="sourceLineNo">058</span>@Beta<a name="line.58"></a>
<span class="sourceLineNo">059</span>public final class Files {<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span>  /** Maximum loop count when creating temp directories. */<a name="line.61"></a>
<span class="sourceLineNo">062</span>  private static final int TEMP_DIR_ATTEMPTS = 10000;<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>  private Files() {}<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>  /**<a name="line.66"></a>
<span class="sourceLineNo">067</span>   * Returns a buffered reader that reads from a file using the given<a name="line.67"></a>
<span class="sourceLineNo">068</span>   * character set.<a name="line.68"></a>
<span class="sourceLineNo">069</span>   *<a name="line.69"></a>
<span class="sourceLineNo">070</span>   * @param file the file to read from<a name="line.70"></a>
<span class="sourceLineNo">071</span>   * @param charset the charset used to decode the input stream; see {@link<a name="line.71"></a>
<span class="sourceLineNo">072</span>   *     Charsets} for helpful predefined constants<a name="line.72"></a>
<span class="sourceLineNo">073</span>   * @return the buffered reader<a name="line.73"></a>
<span class="sourceLineNo">074</span>   */<a name="line.74"></a>
<span class="sourceLineNo">075</span>  public static BufferedReader newReader(File file, Charset charset)<a name="line.75"></a>
<span class="sourceLineNo">076</span>      throws FileNotFoundException {<a name="line.76"></a>
<span class="sourceLineNo">077</span>    checkNotNull(file);<a name="line.77"></a>
<span class="sourceLineNo">078</span>    checkNotNull(charset);<a name="line.78"></a>
<span class="sourceLineNo">079</span>    return new BufferedReader(<a name="line.79"></a>
<span class="sourceLineNo">080</span>        new InputStreamReader(new FileInputStream(file), charset));<a name="line.80"></a>
<span class="sourceLineNo">081</span>  }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>  /**<a name="line.83"></a>
<span class="sourceLineNo">084</span>   * Returns a buffered writer that writes to a file using the given<a name="line.84"></a>
<span class="sourceLineNo">085</span>   * character set.<a name="line.85"></a>
<span class="sourceLineNo">086</span>   *<a name="line.86"></a>
<span class="sourceLineNo">087</span>   * @param file the file to write to<a name="line.87"></a>
<span class="sourceLineNo">088</span>   * @param charset the charset used to encode the output stream; see {@link<a name="line.88"></a>
<span class="sourceLineNo">089</span>   *     Charsets} for helpful predefined constants<a name="line.89"></a>
<span class="sourceLineNo">090</span>   * @return the buffered writer<a name="line.90"></a>
<span class="sourceLineNo">091</span>   */<a name="line.91"></a>
<span class="sourceLineNo">092</span>  public static BufferedWriter newWriter(File file, Charset charset)<a name="line.92"></a>
<span class="sourceLineNo">093</span>      throws FileNotFoundException {<a name="line.93"></a>
<span class="sourceLineNo">094</span>    checkNotNull(file);<a name="line.94"></a>
<span class="sourceLineNo">095</span>    checkNotNull(charset);<a name="line.95"></a>
<span class="sourceLineNo">096</span>    return new BufferedWriter(<a name="line.96"></a>
<span class="sourceLineNo">097</span>        new OutputStreamWriter(new FileOutputStream(file), charset));<a name="line.97"></a>
<span class="sourceLineNo">098</span>  }<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span>  /**<a name="line.100"></a>
<span class="sourceLineNo">101</span>   * Returns a factory that will supply instances of {@link FileInputStream}<a name="line.101"></a>
<span class="sourceLineNo">102</span>   * that read from a file.<a name="line.102"></a>
<span class="sourceLineNo">103</span>   *<a name="line.103"></a>
<span class="sourceLineNo">104</span>   * @param file the file to read from<a name="line.104"></a>
<span class="sourceLineNo">105</span>   * @return the factory<a name="line.105"></a>
<span class="sourceLineNo">106</span>   */<a name="line.106"></a>
<span class="sourceLineNo">107</span>  public static InputSupplier&lt;FileInputStream&gt; newInputStreamSupplier(<a name="line.107"></a>
<span class="sourceLineNo">108</span>      final File file) {<a name="line.108"></a>
<span class="sourceLineNo">109</span>    checkNotNull(file);<a name="line.109"></a>
<span class="sourceLineNo">110</span>    return new InputSupplier&lt;FileInputStream&gt;() {<a name="line.110"></a>
<span class="sourceLineNo">111</span>      @Override<a name="line.111"></a>
<span class="sourceLineNo">112</span>      public FileInputStream getInput() throws IOException {<a name="line.112"></a>
<span class="sourceLineNo">113</span>        return new FileInputStream(file);<a name="line.113"></a>
<span class="sourceLineNo">114</span>      }<a name="line.114"></a>
<span class="sourceLineNo">115</span>    };<a name="line.115"></a>
<span class="sourceLineNo">116</span>  }<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span>  /**<a name="line.118"></a>
<span class="sourceLineNo">119</span>   * Returns a factory that will supply instances of {@link FileOutputStream}<a name="line.119"></a>
<span class="sourceLineNo">120</span>   * that write to a file.<a name="line.120"></a>
<span class="sourceLineNo">121</span>   *<a name="line.121"></a>
<span class="sourceLineNo">122</span>   * @param file the file to write to<a name="line.122"></a>
<span class="sourceLineNo">123</span>   * @return the factory<a name="line.123"></a>
<span class="sourceLineNo">124</span>   */<a name="line.124"></a>
<span class="sourceLineNo">125</span>  public static OutputSupplier&lt;FileOutputStream&gt; newOutputStreamSupplier(<a name="line.125"></a>
<span class="sourceLineNo">126</span>      File file) {<a name="line.126"></a>
<span class="sourceLineNo">127</span>    checkNotNull(file);<a name="line.127"></a>
<span class="sourceLineNo">128</span>    return newOutputStreamSupplier(file, false);<a name="line.128"></a>
<span class="sourceLineNo">129</span>  }<a name="line.129"></a>
<span class="sourceLineNo">130</span><a name="line.130"></a>
<span class="sourceLineNo">131</span>  /**<a name="line.131"></a>
<span class="sourceLineNo">132</span>   * Returns a factory that will supply instances of {@link FileOutputStream}<a name="line.132"></a>
<span class="sourceLineNo">133</span>   * that write to or append to a file.<a name="line.133"></a>
<span class="sourceLineNo">134</span>   *<a name="line.134"></a>
<span class="sourceLineNo">135</span>   * @param file the file to write to<a name="line.135"></a>
<span class="sourceLineNo">136</span>   * @param append if true, the encoded characters will be appended to the file;<a name="line.136"></a>
<span class="sourceLineNo">137</span>   *     otherwise the file is overwritten<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * @return the factory<a name="line.138"></a>
<span class="sourceLineNo">139</span>   */<a name="line.139"></a>
<span class="sourceLineNo">140</span>  public static OutputSupplier&lt;FileOutputStream&gt; newOutputStreamSupplier(<a name="line.140"></a>
<span class="sourceLineNo">141</span>      final File file, final boolean append) {<a name="line.141"></a>
<span class="sourceLineNo">142</span>    checkNotNull(file);<a name="line.142"></a>
<span class="sourceLineNo">143</span>    return new OutputSupplier&lt;FileOutputStream&gt;() {<a name="line.143"></a>
<span class="sourceLineNo">144</span>      @Override<a name="line.144"></a>
<span class="sourceLineNo">145</span>      public FileOutputStream getOutput() throws IOException {<a name="line.145"></a>
<span class="sourceLineNo">146</span>        return new FileOutputStream(file, append);<a name="line.146"></a>
<span class="sourceLineNo">147</span>      }<a name="line.147"></a>
<span class="sourceLineNo">148</span>    };<a name="line.148"></a>
<span class="sourceLineNo">149</span>  }<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>  /**<a name="line.151"></a>
<span class="sourceLineNo">152</span>   * Returns a factory that will supply instances of<a name="line.152"></a>
<span class="sourceLineNo">153</span>   * {@link InputStreamReader} that read a file using the given character set.<a name="line.153"></a>
<span class="sourceLineNo">154</span>   *<a name="line.154"></a>
<span class="sourceLineNo">155</span>   * @param file the file to read from<a name="line.155"></a>
<span class="sourceLineNo">156</span>   * @param charset the charset used to decode the input stream; see {@link<a name="line.156"></a>
<span class="sourceLineNo">157</span>   *     Charsets} for helpful predefined constants<a name="line.157"></a>
<span class="sourceLineNo">158</span>   * @return the factory<a name="line.158"></a>
<span class="sourceLineNo">159</span>   */<a name="line.159"></a>
<span class="sourceLineNo">160</span>  public static InputSupplier&lt;InputStreamReader&gt; newReaderSupplier(File file,<a name="line.160"></a>
<span class="sourceLineNo">161</span>      Charset charset) {<a name="line.161"></a>
<span class="sourceLineNo">162</span>    checkNotNull(file);<a name="line.162"></a>
<span class="sourceLineNo">163</span>    checkNotNull(charset);<a name="line.163"></a>
<span class="sourceLineNo">164</span>    return CharStreams.newReaderSupplier(newInputStreamSupplier(file), charset);<a name="line.164"></a>
<span class="sourceLineNo">165</span>  }<a name="line.165"></a>
<span class="sourceLineNo">166</span><a name="line.166"></a>
<span class="sourceLineNo">167</span>  /**<a name="line.167"></a>
<span class="sourceLineNo">168</span>   * Returns a factory that will supply instances of {@link OutputStreamWriter}<a name="line.168"></a>
<span class="sourceLineNo">169</span>   * that write to a file using the given character set.<a name="line.169"></a>
<span class="sourceLineNo">170</span>   *<a name="line.170"></a>
<span class="sourceLineNo">171</span>   * @param file the file to write to<a name="line.171"></a>
<span class="sourceLineNo">172</span>   * @param charset the charset used to encode the output stream; see {@link<a name="line.172"></a>
<span class="sourceLineNo">173</span>   *     Charsets} for helpful predefined constants<a name="line.173"></a>
<span class="sourceLineNo">174</span>   * @return the factory<a name="line.174"></a>
<span class="sourceLineNo">175</span>   */<a name="line.175"></a>
<span class="sourceLineNo">176</span>  public static OutputSupplier&lt;OutputStreamWriter&gt; newWriterSupplier(File file,<a name="line.176"></a>
<span class="sourceLineNo">177</span>      Charset charset) {<a name="line.177"></a>
<span class="sourceLineNo">178</span>    checkNotNull(file);<a name="line.178"></a>
<span class="sourceLineNo">179</span>    checkNotNull(charset);<a name="line.179"></a>
<span class="sourceLineNo">180</span>    return newWriterSupplier(file, charset, false);<a name="line.180"></a>
<span class="sourceLineNo">181</span>  }<a name="line.181"></a>
<span class="sourceLineNo">182</span><a name="line.182"></a>
<span class="sourceLineNo">183</span>  /**<a name="line.183"></a>
<span class="sourceLineNo">184</span>   * Returns a factory that will supply instances of {@link OutputStreamWriter}<a name="line.184"></a>
<span class="sourceLineNo">185</span>   * that write to or append to a file using the given character set.<a name="line.185"></a>
<span class="sourceLineNo">186</span>   *<a name="line.186"></a>
<span class="sourceLineNo">187</span>   * @param file the file to write to<a name="line.187"></a>
<span class="sourceLineNo">188</span>   * @param charset the charset used to encode the output stream; see {@link<a name="line.188"></a>
<span class="sourceLineNo">189</span>   *     Charsets} for helpful predefined constants<a name="line.189"></a>
<span class="sourceLineNo">190</span>   * @param append if true, the encoded characters will be appended to the file;<a name="line.190"></a>
<span class="sourceLineNo">191</span>   *     otherwise the file is overwritten<a name="line.191"></a>
<span class="sourceLineNo">192</span>   * @return the factory<a name="line.192"></a>
<span class="sourceLineNo">193</span>   */<a name="line.193"></a>
<span class="sourceLineNo">194</span>  public static OutputSupplier&lt;OutputStreamWriter&gt; newWriterSupplier(File file,<a name="line.194"></a>
<span class="sourceLineNo">195</span>      Charset charset, boolean append) {<a name="line.195"></a>
<span class="sourceLineNo">196</span>    checkNotNull(file);<a name="line.196"></a>
<span class="sourceLineNo">197</span>    checkNotNull(charset);<a name="line.197"></a>
<span class="sourceLineNo">198</span>    return CharStreams.newWriterSupplier(<a name="line.198"></a>
<span class="sourceLineNo">199</span>        newOutputStreamSupplier(file, append), charset);<a name="line.199"></a>
<span class="sourceLineNo">200</span>  }<a name="line.200"></a>
<span class="sourceLineNo">201</span><a name="line.201"></a>
<span class="sourceLineNo">202</span>  /**<a name="line.202"></a>
<span class="sourceLineNo">203</span>   * Reads all bytes from a file into a byte array.<a name="line.203"></a>
<span class="sourceLineNo">204</span>   *<a name="line.204"></a>
<span class="sourceLineNo">205</span>   * @param file the file to read from<a name="line.205"></a>
<span class="sourceLineNo">206</span>   * @return a byte array containing all the bytes from file<a name="line.206"></a>
<span class="sourceLineNo">207</span>   * @throws IllegalArgumentException if the file is bigger than the largest<a name="line.207"></a>
<span class="sourceLineNo">208</span>   *     possible byte array (2^31 - 1)<a name="line.208"></a>
<span class="sourceLineNo">209</span>   * @throws IOException if an I/O error occurs<a name="line.209"></a>
<span class="sourceLineNo">210</span>   */<a name="line.210"></a>
<span class="sourceLineNo">211</span>  public static byte[] toByteArray(File file) throws IOException {<a name="line.211"></a>
<span class="sourceLineNo">212</span>    checkNotNull(file);<a name="line.212"></a>
<span class="sourceLineNo">213</span>    checkArgument(file.length() &lt;= Integer.MAX_VALUE);<a name="line.213"></a>
<span class="sourceLineNo">214</span>    if (file.length() == 0) {<a name="line.214"></a>
<span class="sourceLineNo">215</span>      // Some special files are length 0 but have content nonetheless.<a name="line.215"></a>
<span class="sourceLineNo">216</span>      return ByteStreams.toByteArray(newInputStreamSupplier(file));<a name="line.216"></a>
<span class="sourceLineNo">217</span>    } else {<a name="line.217"></a>
<span class="sourceLineNo">218</span>      // Avoid an extra allocation and copy.<a name="line.218"></a>
<span class="sourceLineNo">219</span>      byte[] b = new byte[(int) file.length()];<a name="line.219"></a>
<span class="sourceLineNo">220</span>      Closer closer = Closer.create();<a name="line.220"></a>
<span class="sourceLineNo">221</span>      try {<a name="line.221"></a>
<span class="sourceLineNo">222</span>        InputStream in = closer.add(new FileInputStream(file));<a name="line.222"></a>
<span class="sourceLineNo">223</span>        ByteStreams.readFully(in, b);<a name="line.223"></a>
<span class="sourceLineNo">224</span>      } catch (Throwable e) {<a name="line.224"></a>
<span class="sourceLineNo">225</span>        throw closer.rethrow(e, IOException.class);<a name="line.225"></a>
<span class="sourceLineNo">226</span>      } finally {<a name="line.226"></a>
<span class="sourceLineNo">227</span>        closer.close();<a name="line.227"></a>
<span class="sourceLineNo">228</span>      }<a name="line.228"></a>
<span class="sourceLineNo">229</span>      return b;<a name="line.229"></a>
<span class="sourceLineNo">230</span>    }<a name="line.230"></a>
<span class="sourceLineNo">231</span>  }<a name="line.231"></a>
<span class="sourceLineNo">232</span><a name="line.232"></a>
<span class="sourceLineNo">233</span>  /**<a name="line.233"></a>
<span class="sourceLineNo">234</span>   * Reads all characters from a file into a {@link String}, using the given<a name="line.234"></a>
<span class="sourceLineNo">235</span>   * character set.<a name="line.235"></a>
<span class="sourceLineNo">236</span>   *<a name="line.236"></a>
<span class="sourceLineNo">237</span>   * @param file the file to read from<a name="line.237"></a>
<span class="sourceLineNo">238</span>   * @param charset the charset used to decode the input stream; see {@link<a name="line.238"></a>
<span class="sourceLineNo">239</span>   *     Charsets} for helpful predefined constants<a name="line.239"></a>
<span class="sourceLineNo">240</span>   * @return a string containing all the characters from the file<a name="line.240"></a>
<span class="sourceLineNo">241</span>   * @throws IOException if an I/O error occurs<a name="line.241"></a>
<span class="sourceLineNo">242</span>   */<a name="line.242"></a>
<span class="sourceLineNo">243</span>  public static String toString(File file, Charset charset) throws IOException {<a name="line.243"></a>
<span class="sourceLineNo">244</span>    checkNotNull(file);<a name="line.244"></a>
<span class="sourceLineNo">245</span>    checkNotNull(charset);<a name="line.245"></a>
<span class="sourceLineNo">246</span>    return new String(toByteArray(file), charset);<a name="line.246"></a>
<span class="sourceLineNo">247</span>  }<a name="line.247"></a>
<span class="sourceLineNo">248</span><a name="line.248"></a>
<span class="sourceLineNo">249</span>  /**<a name="line.249"></a>
<span class="sourceLineNo">250</span>   * Copies to a file all bytes from an {@link InputStream} supplied by a<a name="line.250"></a>
<span class="sourceLineNo">251</span>   * factory.<a name="line.251"></a>
<span class="sourceLineNo">252</span>   *<a name="line.252"></a>
<span class="sourceLineNo">253</span>   * @param from the input factory<a name="line.253"></a>
<span class="sourceLineNo">254</span>   * @param to the destination file<a name="line.254"></a>
<span class="sourceLineNo">255</span>   * @throws IOException if an I/O error occurs<a name="line.255"></a>
<span class="sourceLineNo">256</span>   */<a name="line.256"></a>
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<span class="sourceLineNo">866</span>}<a name="line.866"></a>




























































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